shotcrete

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Jamar Adams
Nina Brabham
Anas Ghandorah
Dan Holombo
Materials
Portland cement, lightweight aggregate,
and admixtures
 The same type of reinforcing is used in
shotcrete as in conventional concrete,
like rebar, prestressed steel, and wire
mesh.

Additives
Silica Fume- reduced permeability,
increased compressive and flexural
strength
 Air-Entraining Admixtures- improved
pumpability and freeze-thaw durability
 Fibers- control cracking, improve impact
resistance and energy absorption
 Accelerators- improve placement
characteristics in adverse conditions and
increase production capabilities

Properties
Hardened properties similar to
conventional cast-in-place concrete
 Shotcrete normally has a greater
compressive strength then cast in place
concrete due to lower water to cement
ratio

Placement


Uses compressive
air to spray the
concrete at high
velocities
Can be placed on
soil, existing
concrete, block or
brick, and
prefabricated forms


Wet Mix- all
constituents, water
included, are
thoroughly mixed
before placement
Dry Mix (Gunite)water is added to
dry materials during
placement
Tools and Machines





Concrete output: 50
yd3/hr
Concrete pressure:
1361 psi
Horizontal pumping
distance: 1200 ft
Vertical pumping
distance: 450 ft
Max aggregate size:
1.5 in
Tools and Machines
Wet Mix
2 ½ in. spray nozzle
Dry Mix (Gunite)
2 in. spray nozzle
Applications







Homes and
buildings
Tunnels
Channels
Dams
Retaining walls
Bridge retrofits
Recreation (pools,
zoos, skateparks,
waterparks)
Benefits
Lowers cost due to quick speed of
construction
 Easier to construct complex forms or
shapes
 Can use recycled materials such as fly
ash and rebar in the mix
 Bonds well with most surfaces
 No forming needed, therefore lower
costs

References
http://www.cement.org
 http://www.wseshotcrete.com
 http://www.advancedshotcrete.com
 http://www.gunite.us
 http://www.reedpumps.com
 http://www.earthshelter.com
 http://www.wsdot.wa.gov
 http://www.shotcretetechnologies.com

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